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Butterfly | Teaser (k. mg)

PAIRING: Detective!Mingyu x f. Reader SUMMARY: In a city where technology makes it possible to shed your body as easily as changing clothes, Mingyu has built his reputation hunting criminals who disappear behind new faces. So when you become the prime suspect in a brutal string of serial murders, he should have no trouble closing the case. Except... the more he investigates you, the less he's convinced you're guilty. TEASER WC: 2.3k AU: Cyberpunk, Mystery, Crime GENRE: Strangers to Lovers, some angst, smut RATING: 18+ Minors are strictly prohibited from engaging in and reading this content. It contains explicit content and any minors discovered reading or engaging with this work will be blocked immediately. TEASER WARNINGS: This teaser contains vivid depiction of a dead body that has been intentionally disfigured/messed with by a serial killer - I will call this body horror simply because I want to play it on the safe side, mention of dead bodies in general, depiction of gore and blood (in the dead body scene), bodies being referenced to as 'Skins' because replacing the body is possible in this world, lots of commentary on wealth gap, lots of references to how humanity just doesn't care about human livelihood the same way it did once, mentions of deep poverty, mentions of throw away Skins (bodies) being dumped in an alleyway, Mingyu is kind of emo, Mingyu is a cigarette smoker because what is a detective fic without cigarette smoking A/N: This is for the Cyberpunk: Reload Collab hosted by @studiosvt and I could not be more excited to be bringing this to you! This is heavily inspired by Altered Carbon, Ghost in the Shell, and Blade Runner. This fic is a bit gritty in the visuals so I apologize for the gory bits when Mingyu is investigating murders, but that comes with the genre a little. AN 2: Thank you to the beautiful, wonderful, talented, show stopping, ground breaking, earth shattering, amazing, beautiful, perfect @joshujin for this AMAZING banner because I hated all the ones I made and Trixie is an angel muah. DROP DATE: Sunday, July 19

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it has been said that something as small as the flutter of a butterfly's wing can ultimately cause a typhoon halfway around the world. - chaos theory

"THE BUTTERFLY EFFECT IS A PRINCIPLE IN CHAOS THEORY THAT STATES THAT SMALL, SEEMINGLY INSIGNIFICANT CHANGES IN INITIAL CONDITIONS CAN TRIGGER MASSIVE, UNPREDICTABLE, AND VASTLY DIFFERENT OUTCOMES IN COMPLEX SYSTEMS-"

Mingyu knows what the butterfly effect is. In fact, the exact audio recording playing on loop throughout the penthouse apartment is the same audio that's been haunting his dreams and the moments of almost sleep he's been having at his desk while filling out piles and piles of paperwork at the station.

Now, the audio is playing again at the third crime scene in as many months, and he's had it.

"Turn that shit off," he barks, walking through the flickering holograph of the caution barrier. His legs disrupt the light only for a second, shadows bounding off the walls as he enters the main living area. "I'm tired of hearing about the fucking butterfly effect."

He was tired of researching it, too. Researching why a serial killer would leave the same recording playing at each crime scene over and over again, researching what the murders could possibly have to do with one another. So far, the first five victims have no connection to one another, nothing that clues Mingyu into what's going on beyond the same audio on loop. He doesn't expect this sixth victim will have any connection to their predecessors, but he has to try.

A grisly scene paints the penthouse. It's a nicer home than anything Mingyu will ever afford with floor-to-cieling windows that overlook the neon smear of the city. Rain blurs against the glass, turning the glow beyond to a muted opaque color that clashes with the bright caution banners and the lights of the investigative unit called to the scene.

The penthouse reeks of the metallic tang of blood and the faint tang of the chemicals the collection team uses to take samples all around the apartment. The victim lies splayed across the massive obsidian coffee table in the main entertainment area, arms and legs extended at unnatural angles. It's a male body, the torso filleted open from sternum to pelvis with surgical precision, the ribs cracked outward like grotesque wings.

Mingyu has seen five of these now. Each one has been more elaborate than the last. Each one leaves him with the same hollow frustrating gnawing at his gut.

"Lee," he barks at the lead forensic tech hovering nearby. "Anything different this time? Prints? Core signature? A confession, perhaps?"

Chan shakes his head, his rain-slicked jacket shedding beads of water onto the floor. "Same as the others. No prints, and the audio rig is the same ghost job as the last. The victim owns the building, his name is Harlan Voss. He got a new Skin a few weeks ago at Sync Corp. Nice model, nothing too extreme."

Mingyu crouches beside the table, his boots squelching in the thin layer of blood that has spread across the marble. Through the windows, the city pulses below, bright signs for body rental shops and upgrade clinics flashing in the downpour. Towering buildings disappear into the clouds, connected by old elevated trains that rattle in the distance.

Mingyu looks at the body. Chan had said the Skin upgrade was nothing too extreme, but in a world where people swap bodies regularly, the word extreme has lost most of its value, especially for people like Harlan Voss who are wealthy enough to transfer the Core implanted in their brain stem to a new body anytime they want.

It makes permanent death uncommon for people of this caliber. Mingyu tilts his head to the side, examining the back of Harlan's neck where his Core is. Like the others, it's damaged, which means Harlan is dead dead. No transferring his Core to a new body after the death of this one, no regeneration.

It unsettles something deep in Mingyu like satisfaction, and he pushes it down. He has no time to be disgusted by the Skin jumping of the wealthy while the people below scrap together money to upgrade their Skins to something new or broken just for the prestige of doing it.

Mingyu pushes up to his feet, joints popping and back aching. He groans - unlike the dead victim in front of him, he can't pay to have the tiny device buried in his neck to be transferred to some upgraded flashy skin. One would assume that as law enforcement, he'd get some kind of special discount or offers to enhance his speed, strength or something, but Mingyu has quickly learned that only the wealthy benefit from anything in this city.

He looks around the room slowly, eyes scanning for anything out of place. A broken glass on the bar counter. A half-empty bottle of cheap whiskey tipped over, mixing with the blood into a pink mess. Framed pictures on the walls show vacation spots in brighter cities, the kind most people only see in ads. One frame lies smashed on the floor, exposing basic wiring behind the fancy cover. Typical rich place that looks expensive on top but cheap underneath.

"Why butterflies?" Mingyu mutters to himself. "Chaos theory. One small change leads to big results. Like a butterfly flapping its wings and starting a storm somewhere else."

The killer isn't hiding the message. Each killing has happened once a month - not on a perfect timing, but approximate. Each scene is bigger - more wing shapes, more lights, the same audio. But the victims are never the same and thus far, there's no link between them. No shared friends, no common jobs, nothing on the basic records. A nobody found in a cheap rental unit. An escort pulled from a job. Nothing ties them together except this ritual.

But Mingyu doesn't know what this ritual is.

Frustration burns in his chest. Five months of this, nights bleeding into days at the station, staring at paper files and holoscreens while rain water leaks onto his desk. His own body feels worn out - aches deep in his joints, eyes burning constantly from lack of sleep. Unlike the dead man in front of him, Mingyu can't afford a new Skin on a detective's pay.

"Detective Kim?" Chan calls, voice unsure. Mingyu spins on his heel to find Chan crouched by the body, holding a small device in his hand near the core in the victim's neck. "I think the core is damaged but not dead."

"What?"

Mingyu strides over, his long legs making it easy. Chan crouches lower, the glasses on his face sliding down his sweaty nose. Mingyu leans over, tilting his head as Chan gently nudges the victim's head to turn it more. The Core is exposed to the elements and cut, like the attacker had been cutting it out to kill it, but as it catches the light, there's a small blip of cyan along the side, flickering as it tries to regain connectivity.

"Holy shit," Mingyu whispers. "If it's still alive, can you re-gen this guy?"

"Maybe, but it's potentially damaged enough that he would come back with high-level personality disorders or other cognitive issues. We might be able to repair enough to access memory or information, though." Chan hesitates. "Legal might get involved. If he's got family or others left behind, they might demand the Core be delivered to them to figure out what to do with it or refuse access to us."

Mingyu's hums, thoughtful. The possibility of interference is higher than he'd like to admit. In the few cases that Mingyu has dealt with the elite, their spouses or family left behind have always been nearly impossible in active investigations. He's since learned that those who sit in gilded glass towers have more to hide than the criminals crawling on the ground, and they'd rather a case go cold than unearth their secrets.

"Are we required to notify them?" Mingyu asks, glancing at Chan.

"Yes?"

"What if we only found it was discovered functional later in a proper autopsy."

Chan looks uncomfortable for a moment before nodding. "Yeah. That would make sense."

"Autopsies get delayed, right?" Chan sighs and Mingyu grins, slapping him on the back as he stands again. "Glad we understand each other, Lee. Take care of this while I walk around the area, yeah?"

"Yes, Detective."

Mingyu leaves the apartment and takes the stairs instead of the elevator, his knees protesting with each step. The exercise feels good though, so he jogs down the winding stairs, mind racing. By the time he reaches the ground level, he's sore and his heart is pounding, both reminders that he's human and that he's in his natural body, two things he's grown to be proud of.

The lobby is sleek, made up of polished obsidian and soft blue recessed lighting. Mingyu strolls through the automatic doors, the air locks hissing as he lets himself out into the rain, shoes tapping wetly on the pavement.

Reaching into his pocket, he fishes out a cigarette - an ancient, old world habit in comparison to the sleek vapes most people use - and sticks it between his lips, digging around his pocket for a lighter. He finds it and flicks it, the orange flame licking upward as he lights the cigarette, taking a brief drag. The flame catches and he flicks it shut, taking a heavy drag and lets the smoke settle in his lungs before he exhales into the neon smear of rain.

The street level is quieter this time of night, most of the storefronts closed, their holographic signs still flickering anyway. The street is full of advertising and marketing for Skin modification services, Core implant repairs, temporary Skin rentals for people too poor to own one permanently but desperate enough to spend a night as someone else.

Neon bleeds across the wet pavement in streaks of magenta and cyan, reflecting off the rain to create a blurry kaleidoscope of light that makes Mingyu's eyes water as he takes another drag, flicking ash into a puddle where it melts.

He walks, letting his feet guide him around the perimeter of the building, cool raing tapping down on his head and neck like soft fingers. He doesn't bother with an umbrella, the rain sliding off his jacket as he examines the exterior, cigarette wedged between his lips.

The neighborhood is a mix of high-rises towering over strip malls, luxury boutiques selling pricey mods next to hole-in-the-wall clinics offering illegal and questionable upgrades. It's one of common liminal spaces in the city where the almost wealthy clash with the lower glass, each fighting for dominance on the ground while the megaliths of the city exist in their towers far above.

Mingyu wonders what the rest of them look like from on high. He imagines that they can't even see people like him, rotting beneath the clouds and scurrying around like ants beneath a boot that's constantly waiting to step on them. Mingyu has been stepped on plenty of times, but he hasn't died yet and he doesn't plan on it now, heading to the back alleyway behind the building.

Dumpsters filled with broken tech litter the alleyway, but Mingyu pauses when he sees a bunch of old, rotted Skins. He lifts his arm, covering his face with it to ward off the smell. Skins are still bodies - they're still organic material like any other living organism, and they break down the same way. Seeing tossed Skins isn't uncommon, especially near body-mod shops, but Mingyu is unsettled to see them just tossed, flies buzzing around them.

Pulling out his phone, he dials Chan up stairs. "Send a team down to the back alley, there's discarded Skins. None of them look fresh or functional, but maybe our killer tosses theirs."

"On it."

"Also have someone dispose of these before someone wanders around and tries to take them. They're rotted beyond use, the last thing we need is some kind of infection going around because people are re-genning bad Skins."

"Understood."

Mingyu hangs up the phone and takes the final drag of his cigarette before flicking it toward the dumpster. He continues on his way, searching - for what he doesn't know. Something. Anything. He just wants to find something to help him unravel the mystery upstairs, something he's missed previously.

As always, he finds nothing except the smell of wet concrete and biological decay, the distant hum of an elevated train line cutting through the noise somewhere. He circles back to the front of the building and finds himself looking upward. The building is a vertical monument to wealth that juts up into the rain-soaked sky, but it's got nothing on the monstrosities the corporation owners and mega-rich of the city live in.

The rain grows heavier, coming down in sheets. Mingyu slips under the overhang in front of the building, watching as the world vanishes to a blur of light behind the rain. From here, he knows the city by heart - it spreads out in layers, the commercial district with aggressive neon signage, the old industrial zones still smoking from plants that are ready to collapse any minute, and beyond, the entertainment and wealthy districts.

Trains arc across the space between buildings while autonomous vehicles move through the streets in perfect formation, headlights occasionally cutting through the dark toward him as they pass by the building.

They city pulses on despite the death upstairs, the desperation and money and excess and filth all tangled together, and somewhere in it, is the person Mingyu is hunting, the butterfly that haunts his dreams and all of the hours in between.

Mingyu sighs, jaw clenched as he watches the rain, the same words on loop in his head: The butterfly effect is a principle chaos theory that states that small, seemingly insignificant changes in initial conditions can trigger massive, unpredictable, and vastly different outcomes in complex systems.

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